<template>
  <div class="list" ref="wrapper">
    <div>
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="button-list">
          <div class="button-wrapeer" >
            <div class="button">{{this.currentCity}}</div>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="button-list">
          <div class="button-wrapeer"
               v-for="item of hot"
               :key="item.id"
               @click="handleCityClick(item.name)"
           >
            <div class="button">{{item.name}}</div>
          </div>
        </div>
      </div>
      <div class="area" v-for="(item,key) of cities" :key="key" :ref='key'>
        <div class="title border-topbottom">{{key}}</div>
        <div class="item-list">
          <div class="item border-bottom"
                v-for="innerItem of item"
                :key="innerItem.id"
                @click="handleCityClick(innerItem.name)"
          >
              {{innerItem.name}}
            </div>
        </div>
      </div>
    </div>
  </div>
</template>
<script>
import BScroll from 'better-scroll'
import { mapState } from 'vuex'
export default{
  name: 'CityList',
  props: {
    hot: Array,
    cities: Object,
    letter: String
  },
  methods: {
    handleCityClick (city) {
      this.$store.dispatch('changeCity', city)
      this.$router.push('./')
    }
  },
  computed: {
    ...mapState({
      currentCity: 'city' // 展开运算符也可已是对象
    })
  },
  mounted () {
    this.scroll = new BScroll(this.$refs.wrapper)
  },
  watch: {
    letter () {
      if (this.letter) {
        const element = this.$refs[this.letter][0] // 因为通过for循环得到的ref是素组所以要在后面写【0】
        this.scroll.scrollToElement(element)
      }
    }
  }
}
</script>
<style lang="stylus" scoped="scoped">
 @import "~styles/varibles.styl"
   .border-topbottom
     &:after
      border-color #ccc
     &:before
      border-color #ccc
   .border-bottom
     // &:before
     //  border-color #ccc
    .list
      overflow hidden
      position absolute
      top 1.58rem
      left 0
      right 0
      bottom 0 //本条list以上都是方便使用插件BetterScroll ，令页面不能拖动
     .title
       background-color #eee
       line-height .54rem
       font-size .26rem
       color #666
       padding-left .2rem
     .button-list
       padding .1rem .6rem .1rem .1rem
       overflow hidden
       .button-wrapeer
         float left
         width 33.333%
         .button
           text-align center
           border .01rem solid #ccc
           margin .1rem
           padding .1rem 0
           border-radius .06rem
     .item-list
       padding-left .2rem
       .item
         line-height .54rem
         color #666
</style>
